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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85be96c8f64c485007adb7e572e2854a2aa3b6edea056975c193c170eca854a' 
  AND token = 'FmoSWn1K43wLkIhmnHVJXaW7ed2xfW/DC2QBVQg7eTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}